Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 18:870-873 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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An Evaluation of Control Plots and Moving Means for Error Control in Barley Nurseries1

C Mak, B. L. Harvey and J. D. Berdahl2

Frequently repeated control plots and the moving mean of adjacent plots were compared as methods of controlling error in single-row plots of barley, Hordeum sativum Jess. (H. vulgare L.) Adjustment by either technique was more effective for grain protein content than for grain yield. Covariance adjustment using either moving mean or control plots prevented overadjustment in several instances and was always more effective than percentage adjustment in reducing experimental error. Repeated control plots and moving means gave similar control of experimental error, but control plots had less practical application than moving means. A partially balanced lattice design accomplished superior control to both methods using percentage adjustment and similar control using covariance adjustment. In cases where the number of entries was too large to accommodate an incomplete block design, covariance adjustment using the moving mean would be advantageous.

Key Words: Experimental error • Singlerow plot • Yield • Protein content • Hordeum vulgare L.

1 Taken in part from a Ph.D, thesis submitted by the senior author to the Crop Science Dep., Univ. of Saskatchewan, Saskatchewan, Canada.

2 Lecturer in the Dep. of Genetics and Cellular Biology, Univ. of Malaya, Kuala Lumpur, Malaysia; professor in the Dep. of Crop Science, Univ. of Saskatchewan, Saskatchewan, Canada, and senior research scientist, Northern Great Plains Research Center, USDA, SEA, P.O. Box 459, Mandan, ND 58554.

Received for publication March 14, 1978.




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Copyright © 1978 by the Crop Science Society of America.